Flint River Reservoir
Dougherty County, Georgia1,400 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Mesotrophic
- #2 of 2 in the county
- 33 ft max depth
- Public access
Flint River Reservoir in Dougherty County, Georgia has a water quality grade of A (Excellent). Water clarity: 4.3 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Surface area: 1400 acres.
- Clarity
- 4.3 ft
- Max depth
- ~33 ft est.
- Area
- 1,400 acres
- Type
- Mesotrophic
- Phosphorus
- 30 µg/L
- Chlorophyll-a
- 4.8 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Flint River Reservoir’s letter
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Flint River Reservoir is a 1,400-acre mesotrophic lake in Dougherty County, Georgia with an estimated average depth of about 33 feet. Water quality is graded A based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 1 other monitored lakes in Dougherty County, Flint River Reservoir ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Georgia EPD, last sampled 2025-10-20. Grade methodology: LakeQuality methodology.
What Flint River Reservoir is good for
From access and monitoring records, not editorial picks.
- Big water1,400 acres
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Murky, only visible to about 4.3 ft. Phosphorus 30 µg/L. Chlorophyll-a 4.8 µg/L. TSI 52. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | Not graded |
| Phosphorus | 30 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.8 µg/L | Good |
| Trophic State Index (TSI) | 52 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~33 ft est. |
| Average Depth | ~6 ft est. |
| Surface Area | 1,400 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Georgia has not published bathymetry for Flint River Reservoir.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Flint River Reservoir
Water Quality Trend: ↓ Declining
Based on 14 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.006 m/yr | 14 |
| Phosphorus | ↓ Declining | +1.26 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +0.11 µg/L/yr | 14 |
Reservoir Info (USACE NID)
Flint River Reservoir is a man-made reservoir impounded by the Flint River (completed 1921), built primarily for hydroelectric on the Flint; gravity-type dam, 60 ft tall and 3,497 ft long.
- Surface area
- 1,400 ac
- Normal storage
- 8,000 ac-ft
- Max storage
- 37,000 ac-ft
- Drainage area
- 5,310 sq mi
- Hazard class
- High
- Owner
- Georgia Power Company
Source: USACE National Inventory of Dams, NID ID GA00835 · Operator website
County Ranking
Ranked #2 of 2 lakes in Dougherty County
Nearby Lakes in Dougherty County
Frequently asked questions about Flint River Reservoir
Where is Flint River Reservoir?
- Flint River Reservoir is a lake in Dougherty County, Georgia. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Flint River Reservoir?
- Flint River Reservoir in Dougherty County, Georgia has a water quality grade of A (Excellent). Water clarity: 4.3 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Surface area: 1400 acres.
Is Flint River Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Flint River Reservoir?
- No published bathymetric survey covers Flint River Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 33 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 1400 acres.
Explore Flint River Reservoir across LakeQuality
More Georgia Lake Rankings
Other Grade A Lakes in Georgia
Mesotrophic Lakes in Georgia
Where this data comes from
478 measurements from 2 monitoring stations, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Georgia DNR Environmental Protection Division
21GAEPD_WQX478 samples · 2012–2025
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Turbidity by Nephelometry
- 2120 B ~ Color in Water by Visual Comparison
Monitoring station identifiers (2)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)